php获取从百度搜索进入网站的关键词

php代码

<?php 

function search_word_from() {
	$referer = isset($_SERVER[&#39;HTTP_REFERER&#39;])?$_SERVER[&#39;HTTP_REFERER&#39;]:&#39;&#39;;
	if(strstr( $referer, &#39;baidu.com&#39;)){ //百度
		preg_match( "|baidu.+wo?r?d=([^\&]*)|is", $referer, $tmp );
		$keyword = urldecode( $tmp[1] );
		$from = &#39;baidu&#39;;
	}elseif(strstr( $referer, &#39;google.com&#39;) or strstr( $referer, &#39;google.cn&#39;)){ //谷歌
		preg_match( "|google.+q=([^\&]*)|is", $referer, $tmp );
		$keyword = urldecode( $tmp[1] );
		$from = &#39;google&#39;;
	}elseif(strstr( $referer, &#39;so.com&#39;)){ //360搜索
		preg_match( "|so.+q=([^\&]*)|is", $referer, $tmp );
		$keyword = urldecode( $tmp[1] );
		$from = &#39;360&#39;;	
	}elseif(strstr( $referer, &#39;sogou.com&#39;)){ //搜狗
		preg_match( "|sogou.com.+query=([^\&]*)|is", $referer, $tmp );
		$keyword = urldecode( $tmp[1] );
		$from = &#39;sogou&#39;;	
	}elseif(strstr( $referer, &#39;soso.com&#39;)){ //搜搜
		preg_match( "|soso.com.+w=([^\&]*)|is", $referer, $tmp );
		$keyword = urldecode( $tmp[1] );
		$from = &#39;soso&#39;;
	}else {
		$keyword =&#39;&#39;;
		$from = &#39;&#39;;
	}

	return array(&#39;keyword&#39;=>$keyword,&#39;from&#39;=>$from);
}

//以下为测试
//在搜索引擎搜索个关键词，进入网站
$word = search_word_from();
if(!empty($word[&#39;keyword&#39;])){
	echo &#39;关键字：&#39;.$word[&#39;keyword&#39;].&#39; 来自：&#39;.$word[&#39;from&#39;];
}
?>